采用压密注浆定量纠偏运营地铁盾构隧道技术研究

Quantitative Deviation Correction Technologies for Subway Shield Tunnels in Operation through Compaction Grouting

为解决运营地铁盾构隧道受周边建设项目施工影响发生偏移的问题,提出一种可量化回调量的注浆纠偏方法。通过对压密注浆过程的理论研究和有限元分析,重点研究压密注浆对盾构隧道的纠偏机理,提炼出关键参数,建立注浆作用下盾构隧道竖向位移和水平位移的理论模型和计算公式。分析结果表明,地层压密注浆可有效回调运营地铁盾构隧道发生的位移和变形,可采用体积应变法进行压密注浆模拟,隧道位移可通过分层总和法进行计算,纠偏效果主要控制因素为注浆距离、注浆压力和注浆范围。通过对比现场试验及计算公式结果,验证了该理论模型的合理性和结论的可信性。

To address the problem of deviations in subway shield tunnels in operation caused by surrounding con⁃struction projects,this paper puts forward a quantitative grouting correction method.Through the theoretical study and finite element analysis of the compaction grouting process,the study focuses on the deviation correction mecha⁃nism of compaction grouting on the shield tunnel,obtains the key parameters,and establishes the theoretical model and calculation formulae for the vertical and horizontal displacements of the shield tunnel under the action of grout⁃ing.The analysis results show that the compaction grouting in the strata can effectively correct the displacement and deformation that have occurred in subway shield tunnels in operation,which can be simulated by using the volume strain method for compaction grouting.The tunnel displacement can be calculated by the layered summation meth⁃od,and the main control factors of the correction effect are the grouting distance,grouting pressure,and grouting range.By comparing the results of field tests and calculation formulae,the theoretical model put forward by this pa⁃per is proved reasonable with credible conclusions.